X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fsg.c;h=cc50d6b937e747009b39d1651ab279800ee8a446;hp=3ea1e289604ba6159bf9e3c3f92b3b8d0000ee92;hb=07eb79dfa0e3801875d1c2907cfdb5da7c9d2cb3;hpb=f8fe35e8c9e88dd681ea151251d75f6116a958b4

diff --git a/engines/sg.c b/engines/sg.c
index 3ea1e289..cc50d6b9 100644
--- a/engines/sg.c
+++ b/engines/sg.c
@@ -1,5 +1,7 @@
 /*
- * scsi generic sg v3 io engine
+ * sg engine
+ *
+ * IO engine that uses the Linux SG v3 interface to talk to SCSI devices
  *
  */
 #include <stdio.h>
@@ -10,7 +12,6 @@
 #include <sys/poll.h>
 
 #include "../fio.h"
-#include "../os.h"
 
 #ifdef FIO_HAVE_SGIO
 
@@ -22,7 +23,11 @@ struct sgio_cmd {
 struct sgio_data {
 	struct sgio_cmd *cmds;
 	struct io_u **events;
+	struct pollfd *pfds;
+	int *fd_flags;
+	void *sgbuf;
 	unsigned int bs;
+	int type_checked;
 };
 
 static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
@@ -40,64 +45,93 @@ static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
 	hdr->usr_ptr = io_u;
 
 	if (fs) {
-		hdr->dxferp = io_u->buf;
-		hdr->dxfer_len = io_u->buflen;
+		hdr->dxferp = io_u->xfer_buf;
+		hdr->dxfer_len = io_u->xfer_buflen;
 	}
 }
 
-static int fio_sgio_ioctl_getevents(struct thread_data *td, int fio_unused min,
-				    int max, struct timespec fio_unused *t)
+static int pollin_events(struct pollfd *pfds, int fds)
 {
-	assert(max <= 1);
+	int i;
 
-	/*
-	 * we can only have one finished io_u for sync io, since the depth
-	 * is always 1
-	 */
-	if (list_empty(&td->io_u_busylist))
-		return 0;
+	for (i = 0; i < fds; i++)
+		if (pfds[i].revents & POLLIN)
+			return 1;
 
-	return 1;
+	return 0;
 }
 
-
 static int fio_sgio_getevents(struct thread_data *td, int min, int max,
 			      struct timespec fio_unused *t)
 {
-	struct fio_file *f = &td->files[0];
 	struct sgio_data *sd = td->io_ops->data;
-	struct pollfd pfd = { .fd = f->fd, .events = POLLIN };
-	void *buf = malloc(max * sizeof(struct sg_io_hdr));
-	int left = max, ret, events, i, r = 0, fl = 0;
+	int left = max, ret, r = 0;
+	void *buf = sd->sgbuf;
+	unsigned int i, events;
+	struct fio_file *f;
 
 	/*
-	 * don't block for !events
+	 * Fill in the file descriptors
 	 */
-	if (!min) {
-		fl = fcntl(f->fd, F_GETFL);
-		fcntl(f->fd, F_SETFL, fl | O_NONBLOCK);
+	for_each_file(td, f, i) {
+		/*
+		 * don't block for min events == 0
+		 */
+		if (!min) {
+			sd->fd_flags[i] = fcntl(f->fd, F_GETFL);
+			fcntl(f->fd, F_SETFL, sd->fd_flags[i] | O_NONBLOCK);
+		}
+		sd->pfds[i].fd = f->fd;
+		sd->pfds[i].events = POLLIN;
 	}
 
 	while (left) {
+		void *p;
+
 		do {
 			if (!min)
 				break;
-			poll(&pfd, 1, -1);
-			if (pfd.revents & POLLIN)
+
+			ret = poll(sd->pfds, td->o.nr_files, -1);
+			if (ret < 0) {
+				if (!r)
+					r = -errno;
+				td_verror(td, errno, "poll");
 				break;
-		} while (1);
+			} else if (!ret)
+				continue;
 
-		ret = read(f->fd, buf, left * sizeof(struct sg_io_hdr));
-		if (ret < 0) {
-			if (errno == EAGAIN)
+			if (pollin_events(sd->pfds, td->o.nr_files))
 				break;
-			td_verror(td, errno);
-			r = -1;
+		} while (1);
+
+		if (r < 0)
 			break;
-		} else if (!ret)
+
+re_read:
+		p = buf;
+		events = 0;
+		for_each_file(td, f, i) {
+			ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
+			if (ret < 0) {
+				if (errno == EAGAIN)
+					continue;
+				r = -errno;
+				td_verror(td, errno, "read");
+				break;
+			} else if (ret) {
+				p += ret;
+				events += ret / sizeof(struct sg_io_hdr);
+			}
+		}
+
+		if (r < 0)
 			break;
+		if (!events) {
+			usleep(1000);
+			goto re_read;
+		}
 
-		events = ret / sizeof(struct sg_io_hdr);
 		left -= events;
 		r += events;
 
@@ -108,10 +142,11 @@ static int fio_sgio_getevents(struct thread_data *td, int min, int max,
 		}
 	}
 
-	if (!min)
-		fcntl(f->fd, F_SETFL, fl);
+	if (!min) {
+		for_each_file(td, f, i)
+			fcntl(f->fd, F_SETFL, sd->fd_flags[i]);
+	}
 
-	free(buf);
 	return r;
 }
 
@@ -120,10 +155,15 @@ static int fio_sgio_ioctl_doio(struct thread_data *td,
 {
 	struct sgio_data *sd = td->io_ops->data;
 	struct sg_io_hdr *hdr = &io_u->hdr;
+	int ret;
 
 	sd->events[0] = io_u;
 
-	return ioctl(f->fd, SG_IO, hdr);
+	ret = ioctl(f->fd, SG_IO, hdr);
+	if (ret < 0)
+		return ret;
+
+	return FIO_Q_COMPLETED;
 }
 
 static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync)
@@ -133,22 +173,23 @@ static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync)
 
 	ret = write(f->fd, hdr, sizeof(*hdr));
 	if (ret < 0)
-		return errno;
+		return ret;
 
 	if (sync) {
 		ret = read(f->fd, hdr, sizeof(*hdr));
 		if (ret < 0)
-			return errno;
+			return ret;
+		return FIO_Q_COMPLETED;
 	}
 
-	return 0;
+	return FIO_Q_QUEUED;
 }
 
 static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int sync)
 {
 	struct fio_file *f = io_u->file;
 
-	if (td->filetype == FIO_TYPE_BD)
+	if (f->filetype == FIO_TYPE_BD)
 		return fio_sgio_ioctl_doio(td, f, io_u);
 
 	return fio_sgio_rw_doio(f, io_u, sync);
@@ -160,7 +201,7 @@ static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u)
 	struct sgio_data *sd = td->io_ops->data;
 	int nr_blocks, lba;
 
-	if (io_u->buflen & (sd->bs - 1)) {
+	if (io_u->xfer_buflen & (sd->bs - 1)) {
 		log_err("read/write not sector aligned\n");
 		return EINVAL;
 	}
@@ -183,7 +224,7 @@ static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u)
 	}
 
 	if (hdr->dxfer_direction != SG_DXFER_NONE) {
-		nr_blocks = io_u->buflen / sd->bs;
+		nr_blocks = io_u->xfer_buflen / sd->bs;
 		lba = io_u->offset / sd->bs;
 		hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
 		hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
@@ -210,7 +251,12 @@ static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u)
 		io_u->error = EIO;
 	}
 
-	return io_u->error;
+	if (io_u->error) {
+		td_verror(td, io_u->error, "xfer");
+		return FIO_Q_COMPLETED;
+	}
+
+	return ret;
 }
 
 static struct io_u *fio_sgio_event(struct thread_data *td, int event)
@@ -229,6 +275,7 @@ static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs)
 	int ret;
 
 	io_u = __get_io_u(td);
+	io_u->file = &td->files[0];
 	assert(io_u);
 
 	hdr = &io_u->hdr;
@@ -253,66 +300,97 @@ static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs)
 
 static void fio_sgio_cleanup(struct thread_data *td)
 {
-	if (td->io_ops->data) {
-		free(td->io_ops->data);
+	struct sgio_data *sd = td->io_ops->data;
+
+	if (sd) {
+		free(sd->events);
+		free(sd->cmds);
+		free(sd->fd_flags);
+		free(sd->pfds);
+		free(sd->sgbuf);
+		free(sd);
+
 		td->io_ops->data = NULL;
 	}
 }
 
 static int fio_sgio_init(struct thread_data *td)
 {
-	struct fio_file *f = &td->files[0];
 	struct sgio_data *sd;
-	unsigned int bs;
-	int ret;
 
 	sd = malloc(sizeof(*sd));
 	memset(sd, 0, sizeof(*sd));
-	sd->cmds = malloc(td->iodepth * sizeof(struct sgio_cmd));
-	memset(sd->cmds, 0, td->iodepth * sizeof(struct sgio_cmd));
-	sd->events = malloc(td->iodepth * sizeof(struct io_u *));
-	memset(sd->events, 0, td->iodepth * sizeof(struct io_u *));
+	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
+	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
+	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
+	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
+	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
+	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
+	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
+	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
+	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
+	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
+
 	td->io_ops->data = sd;
 
-	if (td->filetype == FIO_TYPE_BD) {
+	/*
+	 * we want to do it, regardless of whether odirect is set or not
+	 */
+	td->o.override_sync = 1;
+	return 0;
+}
+
+static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
+{
+	struct sgio_data *sd = td->io_ops->data;
+	unsigned int bs;
+
+	if (f->filetype == FIO_TYPE_BD) {
 		if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
-			td_verror(td, errno);
-			goto err;
+			td_verror(td, errno, "ioctl");
+			return 1;
 		}
-	} else if (td->filetype == FIO_TYPE_CHAR) {
-		int version;
+	} else if (f->filetype == FIO_TYPE_CHAR) {
+		int version, ret;
 
 		if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
-			td_verror(td, errno);
-			goto err;
+			td_verror(td, errno, "ioctl");
+			return 1;
 		}
 
 		ret = fio_sgio_get_bs(td, &bs);
 		if (ret)
-			goto err;
+			return 1;
 	} else {
 		log_err("ioengine sgio only works on block devices\n");
-		goto err;
+		return 1;
 	}
 
 	sd->bs = bs;
 
-	if (td->filetype == FIO_TYPE_BD)
-		td->io_ops->getevents = fio_sgio_ioctl_getevents;
-	else
-		td->io_ops->getevents = fio_sgio_getevents;
+	if (f->filetype == FIO_TYPE_BD) {
+		td->io_ops->getevents = NULL;
+		td->io_ops->event = NULL;
+	}
+
+	return 0;
+}
+
+static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
+{
+	struct sgio_data *sd = td->io_ops->data;
+	int ret;
+
+	ret = generic_open_file(td, f);
+	if (ret)
+		return ret;
+
+	if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
+		generic_close_file(td, f);
+		return 1;
+	}
 
-	/*
-	 * we want to do it, regardless of whether odirect is set or not
-	 */
-	td->override_sync = 1;
 	return 0;
-err:
-	free(sd->events);
-	free(sd->cmds);
-	free(sd);
-	td->io_ops->data = NULL;
-	return 1;
 }
 
 static struct ioengine_ops ioengine = {
@@ -324,6 +402,8 @@ static struct ioengine_ops ioengine = {
 	.getevents	= fio_sgio_getevents,
 	.event		= fio_sgio_event,
 	.cleanup	= fio_sgio_cleanup,
+	.open_file	= fio_sgio_open,
+	.close_file	= generic_close_file,
 	.flags		= FIO_SYNCIO | FIO_RAWIO,
 };